#include<stdio.h>

double average(int n){
	double ave;
	int deta;
	int i;
	double sum=0;
	for(i=0;i<n;i++){
		
		scanf("%d",&deta);
		sum+=deta;
	}
	
	ave=sum/n;
	
	return ave;
}
int main()
{
	int n;
	double ave;
	scanf("%d",&n);	
	ave=average(n);
	printf("%.1lf",ave);
	return 0;
 } 
